if you want to fetch only a few talks from #29C3 this might be handy

get-talks.sh

#!/bin/sh

#MIRROR="http://mirror.fem-net.de"
MIRROR="http://ftp.uni-kl.de"
EVENT="CCC/29C3"
QUALITY="mp4-h264-HQ"

TALKS="5146 5319 5275 5198 5219 5088 5285 5385 5210 5374 5244 5239 5306 5044 5327"

BASEURL="${MIRROR}/${EVENT}/${QUALITY}"

get_talk () {
  t=$1
  f=`wget -q -O- $BASEURL |grep -m1 $t|sed 's#.*href="\([^"]*\).*#\1#'`
  if [ -z "$f" ]; then
    echo "Talk $t not found at $BASEURL"
  else
    if [ ! -f $f ]; then
      url="${BASEURL}/${f}"
      echo wget $url
      wget $url
    fi
  fi
}

for TALK in $TALKS; do
  get_talk $TALK
done